Not to beat a dead horse, but I also upgraded from the N5. Keep in mind I loved the N5, coming from a long run of HTC devices, EVO, EVO 3D, EVO LTE, the stock experience and how quick everything was. That said, the N6 runs circles around the N5 in every department. Better radio, hover around 4-5 dB better on all bands that I've noticed compared to N5. Battery life as mentioned is at LEAST double if not triple as good as. I use my phone a ton for an actual phone (~3-4 hours per day) and the N6 could care less. I used to charge the N5 at least every time I was in the car and still charged when I got home at the end of the day. Now, I simply don't charge my phone during the day ever. Since December, I have yet to charge it during the day. I cannot say enough about how great this phone is. I forgot to mention the camera is light years ahead of the N5 also.
Just buy this phone already!